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MB3771 Datasheet(PDF) 8 Page - Cypress Semiconductor

Part # MB3771
Description  Power Supply Monitor
PDF  24 Pages
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Manufacturer  CYPRESS [Cypress Semiconductor]
Direct Link  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

MB3771 Datasheet(HTML) 8 Page - Cypress Semiconductor

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MB3771
Document Number: 002-08511 Rev. *A
Page 8 of 24
8. Application Circuit
8.1 5V Power Supply Monitor
Monitored by VSA. Detection threshold voltage is VSAL and VSAH
8.2 5V Power Supply Voltage Monitor (Externally Fine-Tuned Type)
The VSA detection voltage can be adjusted externally.
Resistance R1 and R2 are set sufficiently lower than the IC internal partial voltage resistance, so that the detection voltage can be set
using the ratio between resistance R1 and R2. (Refer to the table below).
■ R1, R2 calculation formula (when R1 << 100 k, R2 <<40 k)
VSAL := (R1 + R2 ) VSB /R2 [V], VSAH := (R1 + R2 ) (VSB + VHYSB) / R2 [V]
R1 (k)R2 (k)
Detection voltage : VSAL (V)
Detection voltage : VSAH (V)
10
3.9
4.37
4.47
9.1
3.9
4.11
4.20
VCC
CT
RESET
MB3771
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Logic
circuit
VCC
CT
RESET
MB3771
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R1
R2
Logic
Circuit



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